1

Equipment accuracy and stability

Unstable temperature control system;Insufficient accuracy of the vibration table or loading device;Aging of the sensor.

Regularly calibrate the temperature control system and sensors;select high-precision equipment;maintain stable equipment operation.

2

Improper operation led to significant discrepancies in experimental results.

Inadequate understanding of experimental standards;cumbersome operating procedures;insufficient training.

Develop standard operating procedures(SOPs);organize operational training;automate key steps as much as possible.

3

Equipment prone to failure,downtime affects experiments

Wear and tear on mechanical parts;lack of maintenance of heating elements or temperature control systems;high humidity or dust levels in the laboratory.

Establish a regular maintenance system;replace worn parts;improve the experimental environment.

4

Uneven specimen preparation affects test results.

Inadequate asphalt mixing;uneven mold filling;substandard curing conditions.

Mix thoroughly using a mixer;fill in layers and compact with a vibratory tap;strictly control curing time and conditions;sample preparation should be performed according to ASTM/AASHTO/JTG standards,etc.

5

The test data differed significantly from standards or other laboratory data.

The equipment model or test method does not fully match the standard;there are differences in experimental conditions.

Confirm that the equipment meets the standards and specifications;adjust the experimental conditions to be consistent with the standards;verify the standard requirements before each test;record environmental parameters.

6

Incomplete data records make statistical analysis difficult.

Manual recording;incomplete software interface

Use electronic records or a laboratory management system(LIMS);back up data regularly;retain data for at least 5 years;ensure report content is traceable.

7

Temperature,humidity,vibration,or contamination can affect experimental results.

Unstable laboratory environment control

Install a constant temperature and humidity chamber or environmental monitoring system;isolate vibration sources;environmental monitoring data should be recorded synchronously with experimental data.